Auto merge of #2779 - Amanieu:remove_freebsd11, r=Amanieu
Auto merge of #2779 - Amanieu:remove_freebsd11, r=Amanieu

Remove FreeBSD 11 from CI

FreeBSD 11 is EOL and packages for it are no longer provided, which causes the CI job to fail.

cc `@asomers`

rust-lang/libc,rust-lang/libc,rust-lang/libc